Courtney Flatt

Biologists think gulls are eating more juvenile salmon than they thought, and fish advocates are proposing to kill problem gulls. But opponents say dam modification is what's needed to protect salmon.

Earlier this month, thousands of Atlantic salmon escaped a net pen in Washington state, raising concerns from environmentalists and questions about farming non-native species. Here are some answers.

Officials blame the failure of a pen near Washington's Cypress Island on high tides caused by the eclipse, but that is being questioned. Fishing boats are scrambling to catch as many as possible.

There are few inexpensive and low-labor options to control the aggressive field invaders, which sometimes encroach on neighboring farms and potentially cut into their profits.

The popularity of antlers as rustic décor is threatening deer and elk in the Pacific Northwest. The animals can naturally shed antlers, but some people harass or kill animals to get at prized racks.

Most of the trucks that haul your fruits, vegetables and frozen foods to the store are currently cooled by diesel engines, not the cleanest of technologies. But researchers are working on a cooling system based on fuel cells to keep your food cool while it travels.